Valve announced that Call of Duty 4: Modern Warfare, the new action-thriller from Infinity Ward and Activision, is heading to Steam. Beginning today, gamers may pre-purchase the game and begin the playing the moment it's made available on November 12.

One of the most anticipated games of 2007, Call of Duty 4: Modern Warfare arms gamers with an arsenal of advanced and powerful modern day firepower and transports them to the most treacherous hotspots around the globe to take on a rogue enemy group threatening the world.

For more information about Call of Duty 4: Modern Warfare and Steam, visit

GX Note: Having seen Call of Duty 4 in action we can say whilst the SP is short, the MP element of the game more than makes up for it.